You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
27 lines
911 B
Groff
27 lines
911 B
Groff
.TH mmap_shared 3
|
|
.SH NAME
|
|
mmap_shared \- memory map a file for reading and writing
|
|
.SH SYNTAX
|
|
.B #include <mmap.h>
|
|
|
|
char* \fBmmap_shared\fP(const char* \fIfilename\fR,size_t* \fIfilesize\fR);
|
|
.SH DESCRIPTION
|
|
mmap_shared opens \fIfilename\fR for reading and writing, maps the
|
|
whole file into memory, closes the file, writes the length of the file
|
|
to \fIfilesize\fR and returns a pointer to the mapped file.
|
|
|
|
The file is mapped shared. Changes done to the mapped region are
|
|
written to disk and are visible to other processes reading from the file
|
|
or mapping the same file into memory.
|
|
|
|
The file is unmapped by the operating system if the process terminates.
|
|
It can also be manually unmapped by calling \fBmunmap\fR from
|
|
<sys/mman.h>.
|
|
|
|
To write changes to disk immediately, you can use msync from
|
|
<sys/mman.h>.
|
|
|
|
If the file could not be opened or mapped, (void*)0 is returned.
|
|
.SH "SEE ALSO"
|
|
munmap(2), msync(2)
|